class_docstr: A structure to store batch timestamp.
code: def __init__(self, batch_index, timestamp):
      self.batch_index = batch_index
      self.timestamp = timestamp
  
imports: import datetime
  import os
  import time
  from typing import Dict, Optional, Tuple
  from absl import logging
  import numpy
  from six.moves import range
  from six.moves import zip
  import tensorflow
  from tensorflow.core.util import event_pb2
  from tensorflow.python.lib.io import tf_record
label_desc: Use image node_id 1 to create a new BatchTimestamp object from inherited base classes: object with example: obj = BatchTimestamp(batch_index, timestamp)